1 // Map implementation -*- C++ -*-
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53 * This is an internal header file, included by other library headers.
54 * You should not attempt to use it directly.
60 #include <bits/functexcept.h>
61 #include <bits/concept_check.h>
62 #include <initializer_list>
64 _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_D)
67 * @brief A standard container made up of (key,value) pairs, which can be
68 * retrieved based on a key, in logarithmic time.
70 * @ingroup associative_containers
72 * Meets the requirements of a <a href="tables.html#65">container</a>, a
73 * <a href="tables.html#66">reversible container</a>, and an
74 * <a href="tables.html#69">associative container</a> (using unique keys).
75 * For a @c map<Key,T> the key_type is Key, the mapped_type is T, and the
76 * value_type is std::pair<const Key,T>.
78 * Maps support bidirectional iterators.
80 * The private tree data is declared exactly the same way for map and
81 * multimap; the distinction is made entirely in how the tree functions are
82 * called (*_unique versus *_equal, same as the standard).
84 template <typename _Key, typename _Tp, typename _Compare = std::less<_Key>,
85 typename _Alloc = std::allocator<std::pair<const _Key, _Tp> > >
89 typedef _Key key_type;
90 typedef _Tp mapped_type;
91 typedef std::pair<const _Key, _Tp> value_type;
92 typedef _Compare key_compare;
93 typedef _Alloc allocator_type;
96 // concept requirements
97 typedef typename _Alloc::value_type _Alloc_value_type;
98 __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
99 __glibcxx_class_requires4(_Compare, bool, _Key, _Key,
100 _BinaryFunctionConcept)
101 __glibcxx_class_requires2(value_type, _Alloc_value_type, _SameTypeConcept)
105 : public std::binary_function<value_type, value_type, bool>
107 friend class map<_Key, _Tp, _Compare, _Alloc>;
111 value_compare(_Compare __c)
115 bool operator()(const value_type& __x, const value_type& __y) const
116 { return comp(__x.first, __y.first); }
120 /// This turns a red-black tree into a [multi]map.
121 typedef typename _Alloc::template rebind<value_type>::other
124 typedef _Rb_tree<key_type, value_type, _Select1st<value_type>,
125 key_compare, _Pair_alloc_type> _Rep_type;
127 /// The actual tree structure.
131 // many of these are specified differently in ISO, but the following are
132 // "functionally equivalent"
133 typedef typename _Pair_alloc_type::pointer pointer;
134 typedef typename _Pair_alloc_type::const_pointer const_pointer;
135 typedef typename _Pair_alloc_type::reference reference;
136 typedef typename _Pair_alloc_type::const_reference const_reference;
137 typedef typename _Rep_type::iterator iterator;
138 typedef typename _Rep_type::const_iterator const_iterator;
139 typedef typename _Rep_type::size_type size_type;
140 typedef typename _Rep_type::difference_type difference_type;
141 typedef typename _Rep_type::reverse_iterator reverse_iterator;
142 typedef typename _Rep_type::const_reverse_iterator const_reverse_iterator;
144 // [23.3.1.1] construct/copy/destroy
145 // (get_allocator() is normally listed in this section, but seems to have
146 // been accidentally omitted in the printed standard)
148 * @brief Default constructor creates no elements.
154 * @brief Creates a %map with no elements.
155 * @param comp A comparison object.
156 * @param a An allocator object.
159 map(const _Compare& __comp,
160 const allocator_type& __a = allocator_type())
161 : _M_t(__comp, __a) { }
164 * @brief %Map copy constructor.
165 * @param x A %map of identical element and allocator types.
167 * The newly-created %map uses a copy of the allocation object
173 #ifdef __GXX_EXPERIMENTAL_CXX0X__
175 * @brief %Map move constructor.
176 * @param x A %map of identical element and allocator types.
178 * The newly-created %map contains the exact contents of @a x.
179 * The contents of @a x are a valid, but unspecified %map.
182 : _M_t(std::move(__x._M_t)) { }
185 * @brief Builds a %map from an initializer_list.
186 * @param l An initializer_list.
187 * @param comp A comparison object.
188 * @param a An allocator object.
190 * Create a %map consisting of copies of the elements in the
191 * initializer_list @a l.
192 * This is linear in N if the range is already sorted, and NlogN
193 * otherwise (where N is @a l.size()).
195 map(initializer_list<value_type> __l,
196 const _Compare& __c = _Compare(),
197 const allocator_type& __a = allocator_type())
199 { _M_t._M_insert_unique(__l.begin(), __l.end()); }
203 * @brief Builds a %map from a range.
204 * @param first An input iterator.
205 * @param last An input iterator.
207 * Create a %map consisting of copies of the elements from [first,last).
208 * This is linear in N if the range is already sorted, and NlogN
209 * otherwise (where N is distance(first,last)).
211 template<typename _InputIterator>
212 map(_InputIterator __first, _InputIterator __last)
214 { _M_t._M_insert_unique(__first, __last); }
217 * @brief Builds a %map from a range.
218 * @param first An input iterator.
219 * @param last An input iterator.
220 * @param comp A comparison functor.
221 * @param a An allocator object.
223 * Create a %map consisting of copies of the elements from [first,last).
224 * This is linear in N if the range is already sorted, and NlogN
225 * otherwise (where N is distance(first,last)).
227 template<typename _InputIterator>
228 map(_InputIterator __first, _InputIterator __last,
229 const _Compare& __comp,
230 const allocator_type& __a = allocator_type())
232 { _M_t._M_insert_unique(__first, __last); }
234 // FIXME There is no dtor declared, but we should have something
235 // generated by Doxygen. I don't know what tags to add to this
236 // paragraph to make that happen:
238 * The dtor only erases the elements, and note that if the elements
239 * themselves are pointers, the pointed-to memory is not touched in any
240 * way. Managing the pointer is the user's responsibility.
244 * @brief %Map assignment operator.
245 * @param x A %map of identical element and allocator types.
247 * All the elements of @a x are copied, but unlike the copy constructor,
248 * the allocator object is not copied.
251 operator=(const map& __x)
257 #ifdef __GXX_EXPERIMENTAL_CXX0X__
259 * @brief %Map move assignment operator.
260 * @param x A %map of identical element and allocator types.
262 * The contents of @a x are moved into this map (without copying).
263 * @a x is a valid, but unspecified %map.
276 * @brief %Map list assignment operator.
277 * @param l An initializer_list.
279 * This function fills a %map with copies of the elements in the
280 * initializer list @a l.
282 * Note that the assignment completely changes the %map and
283 * that the resulting %map's size is the same as the number
284 * of elements assigned. Old data may be lost.
287 operator=(initializer_list<value_type> __l)
290 this->insert(__l.begin(), __l.end());
295 /// Get a copy of the memory allocation object.
297 get_allocator() const
298 { return _M_t.get_allocator(); }
302 * Returns a read/write iterator that points to the first pair in the
304 * Iteration is done in ascending order according to the keys.
308 { return _M_t.begin(); }
311 * Returns a read-only (constant) iterator that points to the first pair
312 * in the %map. Iteration is done in ascending order according to the
317 { return _M_t.begin(); }
320 * Returns a read/write iterator that points one past the last
321 * pair in the %map. Iteration is done in ascending order
322 * according to the keys.
326 { return _M_t.end(); }
329 * Returns a read-only (constant) iterator that points one past the last
330 * pair in the %map. Iteration is done in ascending order according to
335 { return _M_t.end(); }
338 * Returns a read/write reverse iterator that points to the last pair in
339 * the %map. Iteration is done in descending order according to the
344 { return _M_t.rbegin(); }
347 * Returns a read-only (constant) reverse iterator that points to the
348 * last pair in the %map. Iteration is done in descending order
349 * according to the keys.
351 const_reverse_iterator
353 { return _M_t.rbegin(); }
356 * Returns a read/write reverse iterator that points to one before the
357 * first pair in the %map. Iteration is done in descending order
358 * according to the keys.
362 { return _M_t.rend(); }
365 * Returns a read-only (constant) reverse iterator that points to one
366 * before the first pair in the %map. Iteration is done in descending
367 * order according to the keys.
369 const_reverse_iterator
371 { return _M_t.rend(); }
373 #ifdef __GXX_EXPERIMENTAL_CXX0X__
375 * Returns a read-only (constant) iterator that points to the first pair
376 * in the %map. Iteration is done in ascending order according to the
381 { return _M_t.begin(); }
384 * Returns a read-only (constant) iterator that points one past the last
385 * pair in the %map. Iteration is done in ascending order according to
390 { return _M_t.end(); }
393 * Returns a read-only (constant) reverse iterator that points to the
394 * last pair in the %map. Iteration is done in descending order
395 * according to the keys.
397 const_reverse_iterator
399 { return _M_t.rbegin(); }
402 * Returns a read-only (constant) reverse iterator that points to one
403 * before the first pair in the %map. Iteration is done in descending
404 * order according to the keys.
406 const_reverse_iterator
408 { return _M_t.rend(); }
412 /** Returns true if the %map is empty. (Thus begin() would equal
417 { return _M_t.empty(); }
419 /** Returns the size of the %map. */
422 { return _M_t.size(); }
424 /** Returns the maximum size of the %map. */
427 { return _M_t.max_size(); }
429 // [23.3.1.2] element access
431 * @brief Subscript ( @c [] ) access to %map data.
432 * @param k The key for which data should be retrieved.
433 * @return A reference to the data of the (key,data) %pair.
435 * Allows for easy lookup with the subscript ( @c [] )
436 * operator. Returns data associated with the key specified in
437 * subscript. If the key does not exist, a pair with that key
438 * is created using default values, which is then returned.
440 * Lookup requires logarithmic time.
443 operator[](const key_type& __k)
445 // concept requirements
446 __glibcxx_function_requires(_DefaultConstructibleConcept<mapped_type>)
448 iterator __i = lower_bound(__k);
449 // __i->first is greater than or equivalent to __k.
450 if (__i == end() || key_comp()(__k, (*__i).first))
451 __i = insert(__i, value_type(__k, mapped_type()));
452 return (*__i).second;
455 // _GLIBCXX_RESOLVE_LIB_DEFECTS
456 // DR 464. Suggestion for new member functions in standard containers.
458 * @brief Access to %map data.
459 * @param k The key for which data should be retrieved.
460 * @return A reference to the data whose key is equivalent to @a k, if
461 * such a data is present in the %map.
462 * @throw std::out_of_range If no such data is present.
465 at(const key_type& __k)
467 iterator __i = lower_bound(__k);
468 if (__i == end() || key_comp()(__k, (*__i).first))
469 __throw_out_of_range(__N("map::at"));
470 return (*__i).second;
474 at(const key_type& __k) const
476 const_iterator __i = lower_bound(__k);
477 if (__i == end() || key_comp()(__k, (*__i).first))
478 __throw_out_of_range(__N("map::at"));
479 return (*__i).second;
484 * @brief Attempts to insert a std::pair into the %map.
486 * @param x Pair to be inserted (see std::make_pair for easy creation
489 * @return A pair, of which the first element is an iterator that
490 * points to the possibly inserted pair, and the second is
491 * a bool that is true if the pair was actually inserted.
493 * This function attempts to insert a (key, value) %pair into the %map.
494 * A %map relies on unique keys and thus a %pair is only inserted if its
495 * first element (the key) is not already present in the %map.
497 * Insertion requires logarithmic time.
499 std::pair<iterator, bool>
500 insert(const value_type& __x)
501 { return _M_t._M_insert_unique(__x); }
503 #ifdef __GXX_EXPERIMENTAL_CXX0X__
505 * @brief Attempts to insert a list of std::pairs into the %map.
506 * @param list A std::initializer_list<value_type> of pairs to be
509 * Complexity similar to that of the range constructor.
512 insert(std::initializer_list<value_type> __list)
513 { insert(__list.begin(), __list.end()); }
517 * @brief Attempts to insert a std::pair into the %map.
518 * @param position An iterator that serves as a hint as to where the
519 * pair should be inserted.
520 * @param x Pair to be inserted (see std::make_pair for easy creation
522 * @return An iterator that points to the element with key of @a x (may
523 * or may not be the %pair passed in).
526 * This function is not concerned about whether the insertion
527 * took place, and thus does not return a boolean like the
528 * single-argument insert() does. Note that the first
529 * parameter is only a hint and can potentially improve the
530 * performance of the insertion process. A bad hint would
531 * cause no gains in efficiency.
534 * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt07ch17.html
535 * for more on @a hinting.
537 * Insertion requires logarithmic time (if the hint is not taken).
540 #ifdef __GXX_EXPERIMENTAL_CXX0X__
541 insert(const_iterator __position, const value_type& __x)
543 insert(iterator __position, const value_type& __x)
545 { return _M_t._M_insert_unique_(__position, __x); }
548 * @brief Template function that attempts to insert a range of elements.
549 * @param first Iterator pointing to the start of the range to be
551 * @param last Iterator pointing to the end of the range.
553 * Complexity similar to that of the range constructor.
555 template<typename _InputIterator>
557 insert(_InputIterator __first, _InputIterator __last)
558 { _M_t._M_insert_unique(__first, __last); }
560 #ifdef __GXX_EXPERIMENTAL_CXX0X__
561 // _GLIBCXX_RESOLVE_LIB_DEFECTS
562 // DR 130. Associative erase should return an iterator.
564 * @brief Erases an element from a %map.
565 * @param position An iterator pointing to the element to be erased.
566 * @return An iterator pointing to the element immediately following
567 * @a position prior to the element being erased. If no such
568 * element exists, end() is returned.
570 * This function erases an element, pointed to by the given
571 * iterator, from a %map. Note that this function only erases
572 * the element, and that if the element is itself a pointer,
573 * the pointed-to memory is not touched in any way. Managing
574 * the pointer is the user's responsibility.
577 erase(const_iterator __position)
578 { return _M_t.erase(__position); }
581 * @brief Erases an element from a %map.
582 * @param position An iterator pointing to the element to be erased.
584 * This function erases an element, pointed to by the given
585 * iterator, from a %map. Note that this function only erases
586 * the element, and that if the element is itself a pointer,
587 * the pointed-to memory is not touched in any way. Managing
588 * the pointer is the user's responsibility.
591 erase(iterator __position)
592 { _M_t.erase(__position); }
596 * @brief Erases elements according to the provided key.
597 * @param x Key of element to be erased.
598 * @return The number of elements erased.
600 * This function erases all the elements located by the given key from
602 * Note that this function only erases the element, and that if
603 * the element is itself a pointer, the pointed-to memory is not touched
604 * in any way. Managing the pointer is the user's responsibility.
607 erase(const key_type& __x)
608 { return _M_t.erase(__x); }
610 #ifdef __GXX_EXPERIMENTAL_CXX0X__
611 // _GLIBCXX_RESOLVE_LIB_DEFECTS
612 // DR 130. Associative erase should return an iterator.
614 * @brief Erases a [first,last) range of elements from a %map.
615 * @param first Iterator pointing to the start of the range to be
617 * @param last Iterator pointing to the end of the range to be erased.
618 * @return The iterator @a last.
620 * This function erases a sequence of elements from a %map.
621 * Note that this function only erases the element, and that if
622 * the element is itself a pointer, the pointed-to memory is not touched
623 * in any way. Managing the pointer is the user's responsibility.
626 erase(const_iterator __first, const_iterator __last)
627 { return _M_t.erase(__first, __last); }
630 * @brief Erases a [first,last) range of elements from a %map.
631 * @param first Iterator pointing to the start of the range to be
633 * @param last Iterator pointing to the end of the range to be erased.
635 * This function erases a sequence of elements from a %map.
636 * Note that this function only erases the element, and that if
637 * the element is itself a pointer, the pointed-to memory is not touched
638 * in any way. Managing the pointer is the user's responsibility.
641 erase(iterator __first, iterator __last)
642 { _M_t.erase(__first, __last); }
646 * @brief Swaps data with another %map.
647 * @param x A %map of the same element and allocator types.
649 * This exchanges the elements between two maps in constant
650 * time. (It is only swapping a pointer, an integer, and an
651 * instance of the @c Compare type (which itself is often
652 * stateless and empty), so it should be quite fast.) Note
653 * that the global std::swap() function is specialized such
654 * that std::swap(m1,m2) will feed to this function.
658 { _M_t.swap(__x._M_t); }
661 * Erases all elements in a %map. Note that this function only
662 * erases the elements, and that if the elements themselves are
663 * pointers, the pointed-to memory is not touched in any way.
664 * Managing the pointer is the user's responsibility.
672 * Returns the key comparison object out of which the %map was
677 { return _M_t.key_comp(); }
680 * Returns a value comparison object, built from the key comparison
681 * object out of which the %map was constructed.
685 { return value_compare(_M_t.key_comp()); }
687 // [23.3.1.3] map operations
689 * @brief Tries to locate an element in a %map.
690 * @param x Key of (key, value) %pair to be located.
691 * @return Iterator pointing to sought-after element, or end() if not
694 * This function takes a key and tries to locate the element with which
695 * the key matches. If successful the function returns an iterator
696 * pointing to the sought after %pair. If unsuccessful it returns the
697 * past-the-end ( @c end() ) iterator.
700 find(const key_type& __x)
701 { return _M_t.find(__x); }
704 * @brief Tries to locate an element in a %map.
705 * @param x Key of (key, value) %pair to be located.
706 * @return Read-only (constant) iterator pointing to sought-after
707 * element, or end() if not found.
709 * This function takes a key and tries to locate the element with which
710 * the key matches. If successful the function returns a constant
711 * iterator pointing to the sought after %pair. If unsuccessful it
712 * returns the past-the-end ( @c end() ) iterator.
715 find(const key_type& __x) const
716 { return _M_t.find(__x); }
719 * @brief Finds the number of elements with given key.
720 * @param x Key of (key, value) pairs to be located.
721 * @return Number of elements with specified key.
723 * This function only makes sense for multimaps; for map the result will
724 * either be 0 (not present) or 1 (present).
727 count(const key_type& __x) const
728 { return _M_t.find(__x) == _M_t.end() ? 0 : 1; }
731 * @brief Finds the beginning of a subsequence matching given key.
732 * @param x Key of (key, value) pair to be located.
733 * @return Iterator pointing to first element equal to or greater
734 * than key, or end().
736 * This function returns the first element of a subsequence of elements
737 * that matches the given key. If unsuccessful it returns an iterator
738 * pointing to the first element that has a greater value than given key
739 * or end() if no such element exists.
742 lower_bound(const key_type& __x)
743 { return _M_t.lower_bound(__x); }
746 * @brief Finds the beginning of a subsequence matching given key.
747 * @param x Key of (key, value) pair to be located.
748 * @return Read-only (constant) iterator pointing to first element
749 * equal to or greater than key, or end().
751 * This function returns the first element of a subsequence of elements
752 * that matches the given key. If unsuccessful it returns an iterator
753 * pointing to the first element that has a greater value than given key
754 * or end() if no such element exists.
757 lower_bound(const key_type& __x) const
758 { return _M_t.lower_bound(__x); }
761 * @brief Finds the end of a subsequence matching given key.
762 * @param x Key of (key, value) pair to be located.
763 * @return Iterator pointing to the first element
764 * greater than key, or end().
767 upper_bound(const key_type& __x)
768 { return _M_t.upper_bound(__x); }
771 * @brief Finds the end of a subsequence matching given key.
772 * @param x Key of (key, value) pair to be located.
773 * @return Read-only (constant) iterator pointing to first iterator
774 * greater than key, or end().
777 upper_bound(const key_type& __x) const
778 { return _M_t.upper_bound(__x); }
781 * @brief Finds a subsequence matching given key.
782 * @param x Key of (key, value) pairs to be located.
783 * @return Pair of iterators that possibly points to the subsequence
784 * matching given key.
786 * This function is equivalent to
788 * std::make_pair(c.lower_bound(val),
789 * c.upper_bound(val))
791 * (but is faster than making the calls separately).
793 * This function probably only makes sense for multimaps.
795 std::pair<iterator, iterator>
796 equal_range(const key_type& __x)
797 { return _M_t.equal_range(__x); }
800 * @brief Finds a subsequence matching given key.
801 * @param x Key of (key, value) pairs to be located.
802 * @return Pair of read-only (constant) iterators that possibly points
803 * to the subsequence matching given key.
805 * This function is equivalent to
807 * std::make_pair(c.lower_bound(val),
808 * c.upper_bound(val))
810 * (but is faster than making the calls separately).
812 * This function probably only makes sense for multimaps.
814 std::pair<const_iterator, const_iterator>
815 equal_range(const key_type& __x) const
816 { return _M_t.equal_range(__x); }
818 template<typename _K1, typename _T1, typename _C1, typename _A1>
820 operator==(const map<_K1, _T1, _C1, _A1>&,
821 const map<_K1, _T1, _C1, _A1>&);
823 template<typename _K1, typename _T1, typename _C1, typename _A1>
825 operator<(const map<_K1, _T1, _C1, _A1>&,
826 const map<_K1, _T1, _C1, _A1>&);
830 * @brief Map equality comparison.
832 * @param y A %map of the same type as @a x.
833 * @return True iff the size and elements of the maps are equal.
835 * This is an equivalence relation. It is linear in the size of the
836 * maps. Maps are considered equivalent if their sizes are equal,
837 * and if corresponding elements compare equal.
839 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
841 operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
842 const map<_Key, _Tp, _Compare, _Alloc>& __y)
843 { return __x._M_t == __y._M_t; }
846 * @brief Map ordering relation.
848 * @param y A %map of the same type as @a x.
849 * @return True iff @a x is lexicographically less than @a y.
851 * This is a total ordering relation. It is linear in the size of the
852 * maps. The elements must be comparable with @c <.
854 * See std::lexicographical_compare() for how the determination is made.
856 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
858 operator<(const map<_Key, _Tp, _Compare, _Alloc>& __x,
859 const map<_Key, _Tp, _Compare, _Alloc>& __y)
860 { return __x._M_t < __y._M_t; }
862 /// Based on operator==
863 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
865 operator!=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
866 const map<_Key, _Tp, _Compare, _Alloc>& __y)
867 { return !(__x == __y); }
869 /// Based on operator<
870 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
872 operator>(const map<_Key, _Tp, _Compare, _Alloc>& __x,
873 const map<_Key, _Tp, _Compare, _Alloc>& __y)
874 { return __y < __x; }
876 /// Based on operator<
877 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
879 operator<=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
880 const map<_Key, _Tp, _Compare, _Alloc>& __y)
881 { return !(__y < __x); }
883 /// Based on operator<
884 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
886 operator>=(const map<_Key, _Tp, _Compare, _Alloc>& __x,
887 const map<_Key, _Tp, _Compare, _Alloc>& __y)
888 { return !(__x < __y); }
890 /// See std::map::swap().
891 template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
893 swap(map<_Key, _Tp, _Compare, _Alloc>& __x,
894 map<_Key, _Tp, _Compare, _Alloc>& __y)
897 _GLIBCXX_END_NESTED_NAMESPACE
899 #endif /* _STL_MAP_H */